Proper Orthogonal Decomposition of Pressure Fields in a Draft Tube Cone of the Francis (Tokke) Turbine Model

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dc.contributor.authorŠtefan, Davidcs
dc.contributor.authorRudolf, Pavelcs
dc.coverage.issue1cs
dc.coverage.volume579cs
dc.date.accessioned2019-04-03T03:54:36Z
dc.date.available2019-04-03T03:54:36Z
dc.date.issued2015-01-06cs
dc.description.abstractThe simulations of high head Francis turbine model (Tokke) are performed for three operating conditions - Part Load, Best Efficiency Point (BEP) and Full Load using software Ansys Fluent R15 and alternatively OpenFOAM 2.2.2. For both solvers the simulations employ Realizable k-epsilon turbulence model. The unsteady pressure pulsations of pressure signal from two monitoring points situated in the draft tube cone and one behind the guide vanes are evaluated for all three operating conditions in order to compare frequencies and amplitudes with the experimental results. The computed velocity fields are compared with the experimental ones using LDA measurements in two locations situated in the draft tube cone. The proper orthogonal decomposition (POD) is applied on a longitudinal slice through the draft tube cone. The unsteady static pressure fields are decomposed and a spatio-temporal behavior of modes is correlated with amplitude-frequency results obtained from the pressure signal in monitoring points. The main application of POD is to describe which modes are related to an interaction between rotor (turbine runner) and stator (spiral casing and guide vanes) and cause dynamic flow behavior in the draft tube. The numerically computed efficiency is correlated with the experimental one in order to verify the simulation accuracy.en
dc.description.abstractČlánek se zabývá CFD simulací modelu vysokospádové Francisovy turbíny (Tokke) s využitím dvou spftware, komerční ANSYS Fluent a nekomerční OpenFOAM. Je provedeno vyhodnocení integrálních hydraulické účinnosti, spádu, kroutícího mementu atd. pro tři různé provozní body. Dále je provedena POD analýza tlakového pole řezem kužele savky. Srovnány jsou rychlsotní profily v savce z LDA měření s numerickým výpočtem a tlakové pulzace v savce a v mezeře mezi rozvaděčem a oběžným kolem. Závěrem je porovnána shoda mezi experimentálním měřením a CFD výpočty.cs
dc.formattextcs
dc.format.extent1-14cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationJournal of Physics: Conference Series. 2015, vol. 579, issue 1, p. 1-14.en
dc.identifier.doi10.1088/1742-6596/579/1/012002cs
dc.identifier.issn1742-6596cs
dc.identifier.other111311cs
dc.identifier.urihttp://hdl.handle.net/11012/70891
dc.language.isoencs
dc.publisherIOP Publishingcs
dc.relation.ispartofJournal of Physics: Conference Seriescs
dc.relation.urihttp://iopscience.iop.org/1742-6596/579/1/012002/cs
dc.rights(C) IOP Publishingcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1742-6596/cs
dc.subjectPODen
dc.subjectCFDen
dc.subjectOpenFOAMen
dc.subjectFluenten
dc.subjectFrancis turbineen
dc.subjectvlastní ortogonální dekompozice
dc.subjectPOD
dc.subjectOpenFOAM
dc.subjectFluent
dc.subjectFrancisova turbína
dc.titleProper Orthogonal Decomposition of Pressure Fields in a Draft Tube Cone of the Francis (Tokke) Turbine Modelen
dc.title.alternativeVlastní ortogonální dekompozice tlakových polí v kuželu savky modelové Francisovy (Tokke) turbínycs
dc.type.driverconferenceObjecten
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-111311en
sync.item.dbtypeVAVen
sync.item.insts2020.03.31 00:58:57en
sync.item.modts2020.03.30 22:58:58en
thesis.grantorVysoké učení technické v Brně. Fakulta strojního inženýrství. Energetický ústavcs
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